CN112420777A - Cover window and display device with same - Google Patents

Cover window and display device with same Download PDF

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Publication number
CN112420777A
CN112420777A CN202010846788.3A CN202010846788A CN112420777A CN 112420777 A CN112420777 A CN 112420777A CN 202010846788 A CN202010846788 A CN 202010846788A CN 112420777 A CN112420777 A CN 112420777A
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CN
China
Prior art keywords
section
curvature
cover window
radius
angle
Prior art date
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Pending
Application number
CN202010846788.3A
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Chinese (zh)
Inventor
崔成敏
李旭宰
朴汉起
白南锡
李令名
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung Display Co Ltd
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Samsung Display Co Ltd
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Filing date
Publication date
Application filed by Samsung Display Co Ltd filed Critical Samsung Display Co Ltd
Publication of CN112420777A publication Critical patent/CN112420777A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1626—Constructional details or arrangements for portable computers with a single-body enclosure integrating a flat display, e.g. Personal Digital Assistants [PDAs]
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/84—Passivation; Containers; Encapsulations
    • H10K50/841—Self-supporting sealing arrangements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • G02F1/133331—Cover glasses
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
    • G06F1/1637—Details related to the display arrangement, including those related to the mounting of the display in the housing
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
    • G06F1/1637—Details related to the display arrangement, including those related to the mounting of the display in the housing
    • G06F1/1652—Details related to the display arrangement, including those related to the mounting of the display in the housing the display being flexible, e.g. mimicking a sheet of paper, or rollable
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/84—Passivation; Containers; Encapsulations
    • H10K50/844—Encapsulations
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K77/00—Constructional details of devices covered by this subclass and not covered by groups H10K10/80, H10K30/80, H10K50/80 or H10K59/80
    • H10K77/10—Substrates, e.g. flexible substrates
    • H10K77/111—Flexible substrates
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
    • H01L27/144—Devices controlled by radiation
    • H01L27/146—Imager structures
    • H01L27/14678—Contact-type imagers
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K2102/00—Constructional details relating to the organic devices covered by this subclass
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K2102/00—Constructional details relating to the organic devices covered by this subclass
    • H10K2102/301—Details of OLEDs
    • H10K2102/311—Flexible OLED
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/868—Arrangements for polarized light emission
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/40—OLEDs integrated with touch screens
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/87—Passivation; Containers; Encapsulations
    • H10K59/871—Self-supporting sealing arrangements
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/87—Passivation; Containers; Encapsulations
    • H10K59/873—Encapsulations
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/8793—Arrangements for polarized light emission
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/549—Organic PV cells

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Computer Hardware Design (AREA)
  • Optics & Photonics (AREA)
  • Human Computer Interaction (AREA)
  • General Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Mathematical Physics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

The present application relates to a cover window and a display device including the same. The cover window includes a flat portion and a curved portion extending from an end of the flat portion. The curved portion of the cover window includes a first section, a second section, and a third section, wherein the second section is disposed between the first section and the third section, the inner surface of the cover window is in contact with the adhesive layer, the first radius of curvature is greater than the second radius of curvature, and the third radius of curvature is greater than the second radius of curvature, wherein the first radius of curvature has an average of the radii of curvature of the inner surface of the cover window in the first section, the second radius of curvature has an average of the radii of curvature of the inner surface of the cover window in the second section, and the third radius of curvature has an average of the radii of curvature of the inner surface of the cover window in the third section.

Description

Cover window and display device with same
Technical Field
Exemplary embodiments relate generally to a cover window and a display device having the same. More particularly, exemplary embodiments relate to a cover window including a curved portion for a display device and a display device including the same.
Background
Recently, as the technology has advanced, display products having a small size, light weight, and excellent performance have been produced. Conventional Cathode Ray Tube (CRT) televisions have been widely used for display devices with many advantages in terms of performance and price. Recently, various other display device technologies, such as a plasma display device, a liquid crystal display device, and an organic light emitting display device, have been developed, which overcome the disadvantages of CRTs in terms of miniaturization or portability and have advantages such as miniaturization, light weight, and low power consumption.
Each of the display devices includes a display panel configured to display an image and a transparent cover window attached to a display surface of the display panel to cover the display surface. The cover window protects the display panel from external impact, scratch, etc. applied during use. A typical cover window is formed of plastic resin and is manufactured through an injection molding process using a mold.
Recently, as smart phones and tablet PCs are increasingly used, display devices mounted to the above devices are required to have diversity in design. In order to satisfy the diversity, a display device provided with a flexible display panel and a cover window having a curved portion (for example, referred to as an "edge type" display device) has been proposed.
However, when the display panel is attached to the curved portion of the cover window, the radius of curvature may be reduced as the curved angle of the curved portion becomes steep, thereby causing various defects, such as bubbles generated due to a bonding process or peeling occurring after the bonding process.
The above information disclosed in this background section is only for background understanding of the inventive concept and, therefore, may contain information that does not constitute prior art.
Disclosure of Invention
Exemplary embodiments provide a cover window for a display device, the cover window including a curved portion having improved quality.
Exemplary embodiments also provide a display device including the cover window.
Additional features of the inventive concept will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the inventive concept.
An exemplary embodiment provides a cover window including a flat portion and a curved portion extending from an end of the flat portion. The curved portion of the cover window includes a first section, a second section, and a third section, the second section being disposed between the first section and the third section. The inner surface of the cover window is in contact with the adhesive layer. The first radius of curvature is greater than the second radius of curvature, and the third radius of curvature is greater than the second radius of curvature, wherein the first radius of curvature has an average of the radii of curvature of the inner surface of the cover window in the first section, the second radius of curvature has an average of the radii of curvature of the inner surface of the cover window in the second section, and the third radius of curvature has an average of the radii of curvature of the inner surface of the cover window in the third section.
The curved portion of the cover window may further include a fourth section that is an outer end portion of the curved portion, and the first to third sections may be positioned between the flat portion and the fourth section. Additionally, the fourth radius of curvature may be less than the third radius of curvature, wherein the fourth radius of curvature has an average of the radii of curvature of the inner surface of the cover window in the fourth section.
The curved portion of the cover window may further include a fifth section, which may be a portion where the curved portion is connected with the flat portion, and the fifth section may be positioned between the first section and the flat portion. In addition, the fifth radius of curvature may be greater than the first to fourth radii of curvature, wherein the fifth radius of curvature has an average of the radii of curvature of the inner surface of the cover window in the fifth section.
The curved portion of the cover window may further include a sixth section, and the sixth section may be positioned between the first section and the fifth section. Additionally, the sixth radius of curvature may be greater than the first radius of curvature and less than the fifth radius of curvature, wherein the sixth radius of curvature has an average of the radii of curvature of the inner surface of the cover window in the sixth section.
A central angle of the circular arc of the inner surface of the cover window in the first section is a first angle, a central angle of the circular arc of the inner surface of the cover window in the second section is a second angle, a central angle of the circular arc of the inner surface of the cover window in the third section is a third angle, a central angle of the circular arc of the inner surface of the cover window in the fourth section is a fourth angle, a central angle of the circular arc of the inner surface of the cover window in the fifth section is a fifth angle, a central angle of the circular arc of the inner surface of the cover window in the sixth section is a sixth angle, and a ratio of the first angle to the sixth angle may be 1.00: 0.43: 0.43: 0.62: 0.10: 0.62, and the ratio of the first radius of curvature to the sixth radius of curvature may be 0.15: 0.12: 0.19: 0.12: 1.00: 0.24.
the central angle of the circular arc of the inner surface of the cover window in the first section is a first angle, the central angle of the circular arc of the inner surface of the cover window in the second section is a second angle, the central angle of the circular arc of the inner surface of the cover window in the third section is a third angle, and the first angle may be greater than the second angle and the third angle.
Another exemplary embodiment provides a display device including a flexible display panel, a cover window disposed on the flexible display panel and including a flat portion and a bent portion extending from an end of the flat portion, and an adhesive layer disposed between the flexible display panel and the cover window to attach the flexible display panel to the cover window. The curved portion of the cover window includes a first section, a second section, and a third section, the second section being disposed between the first section and the third section. The inner surface of the cover window is in contact with the adhesive layer. The first radius of curvature is greater than the second radius of curvature, and the third radius of curvature is greater than the second radius of curvature, wherein the first radius of curvature has an average of the radii of curvature of the inner surface of the cover window in the first section, the second radius of curvature has an average of the radii of curvature of the inner surface of the cover window in the second section, and the third radius of curvature has an average of the radii of curvature of the inner surface of the cover window in the third section.
The curved portion of the cover window may further include a fourth section, the fourth section may be an outer end portion of the curved portion, and the first to third sections may be positioned between the flat portion and the fourth section. Additionally, the fourth radius of curvature may be less than the third radius of curvature, wherein the fourth radius of curvature has an average of the radii of curvature of the inner surface of the cover window in the fourth section.
The curved portion of the cover window may further include a fifth section, which may be a portion where the curved portion is connected with the flat portion, and the fifth section may be positioned between the first section and the flat portion. In addition, the fifth radius of curvature may be greater than the first to fourth radii of curvature, wherein the fifth radius of curvature has an average of the radii of curvature of the inner surface of the cover window in the fifth section.
The curved portion of the cover window may further include a sixth section, and the sixth section may be positioned between the first section and the fifth section. In addition, the sixth radius of curvature may be greater than the first radius of curvature and less than the fifth radius of curvature, the sixth radius of curvature having an average of the radii of curvature of the inner surface of the cover window in the sixth section.
The central angle of the circular arc of the inner surface of the cover window in the first section may have a first angle, the central angle of the circular arc of the inner surface of the cover window in the second section may have a second angle, the central angle of the circular arc of the inner surface of the cover window in the third section may have a third angle, the central angle of the circular arc of the inner surface of the cover window in the fourth section may have a fourth angle, the central angle of the circular arc of the inner surface of the cover window in the fifth section may have a fifth angle, the central angle of the circular arc of the inner surface of the cover window in the sixth section may have a sixth angle, and a ratio of the first angle to the sixth angle may be 1.00: 0.43: 0.43: 0.62: 0.10: 0.62, and the ratio of the first radius of curvature to the sixth radius of curvature may be 0.15: 0.12: 0.19: 0.12: 1.00: 0.24.
the central angle of the circular arc of the inner surface of the cover window in the first section may have a first angle, the central angle of the circular arc of the inner surface of the cover window in the second section may have a second angle, the central angle of the circular arc of the inner surface of the cover window in the third section may have a third angle, and the first angle may be greater than the second angle and the third angle.
The radius of curvature of the inner surface of the cover window in the curved portion may be continuously varied from a portion of the cover window contacting the flat portion to the outer edge of the cover window.
The central angle of the arc of the inner surface of the cover window with respect to the entire curved portion may be greater than 80 degrees.
The flat portion may extend in a first direction, and the curved portion may be curved in a second direction perpendicular to the first direction to form a curved surface. In addition, the length of the curved portion of the cover window in the first direction may be less than 5mm, and the length of the curved portion of the cover window in the second direction may be less than 1.5 mm.
The flexible display panel may be an organic light emitting display panel, and may include a thin film encapsulation layer bonded to the adhesive layer. In addition, the thin film encapsulation layer may include at least one inorganic layer and at least one organic layer.
The adhesive layer may include an Optically Clear Adhesive (OCA), a Super Vision Resin (SVR), a Pressure Sensitive Adhesive (PSA), or an Optically Clear Resin (OCR).
Another exemplary embodiment provides a display device including a flexible display panel, a cover window disposed on the flexible display panel and including a flat portion and a curved portion extending from an end of the flat portion, and an adhesive layer disposed between the flexible display panel and the cover window to attach the flexible display panel to the cover window. The inner surface of the cover window may be in contact with the adhesive layer. The curved portion of the cover window may include a connection section connected to the flat portion, an outermost section formed at an outer edge of the cover window, and an intermediate section disposed between the connection section and the outermost section. The connecting section radius of curvature may be greater than the intermediate section radius of curvature and the outermost section radius of curvature, and the outermost section radius of curvature may be less than the intermediate section radius of curvature, wherein the connecting section radius of curvature has an average of the radii of curvature of the inner surface of the cover window in the connecting section, the intermediate section radius of curvature has an average of the radii of curvature of the inner surface of the cover window in the intermediate section, and the outermost section radius of curvature has an average of the radii of curvature of the inner surface of the cover window in the outermost section.
The intermediate section may include a first section, a second section, and a third section, the second section being disposed between the first section and the third section. In addition, the first radius of curvature may be greater than the second radius of curvature, wherein the first radius of curvature has an average of the radii of curvature of the inner surface of the cover window in the first section and the second radius of curvature has an average of the radii of curvature of the inner surface of the cover window in the second section. Further, the third radius of curvature may be greater than the second radius of curvature, wherein the third radius of curvature has an average of the radii of curvature of the inner surface of the cover window in the third section.
The flexible display panel may be an organic light emitting display panel, and may include a thin film encapsulation layer bonded to the adhesive layer. In addition, the thin film encapsulation layer may include at least one inorganic layer and at least one organic layer, and the adhesive layer may include an Optically Clear Adhesive (OCA), a Super Vision Resin (SVR), a Pressure Sensitive Adhesive (PSA), or an Optically Clear Resin (OCR).
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the inventive concept.
Fig. 1 is a perspective view illustrating a display device including a cover window according to an exemplary embodiment.
Fig. 2 is a sectional view illustrating a cover window and a display panel of the display device 100 of fig. 1.
Fig. 3 is a sectional view illustrating one of the curved portions (i.e., portion a in fig. 2) of the cover window and the display panel in fig. 2.
Fig. 4 is a diagram illustrating a first radius of curvature and a first angle of the lower surface of the cover window in the first section in fig. 3.
Fig. 5 is a graph illustrating a radius of curvature according to a position of an inner surface of the cover window at a curved portion in fig. 3.
Fig. 6A is a graph showing a sectional shape of a bent portion of a display device according to a comparative example, stress of a thin film encapsulation layer, and a peeling load of an adhesive layer.
Fig. 6B is a graph illustrating a sectional shape of a bent portion of a display device, stress of a thin film encapsulation layer, and a peeling load of an adhesive layer according to an exemplary embodiment.
Detailed Description
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of various exemplary embodiments of the present invention. As used herein, an "embodiment" is a non-limiting example of an apparatus or method that employs one or more of the inventive concepts disclosed herein. It may be evident, however, that the various exemplary embodiments may be practiced without these specific details or with one or more equivalent arrangements. In other instances, well-known structures and devices are shown in block diagram form in order to avoid unnecessarily obscuring the various exemplary embodiments. Furthermore, the various exemplary embodiments may be different, but are not necessarily exclusive. For example, the particular shapes, configurations and characteristics of the exemplary embodiments may be used or practiced in another exemplary embodiment without departing from the inventive concept.
The exemplary embodiments shown, unless otherwise indicated, are to be understood as providing exemplary features of varying detail of some ways in which the inventive concept may be practiced. Thus, unless otherwise indicated, features, components, modules, layers, films, panels, regions, and/or aspects and the like (hereinafter, referred to individually or collectively as "elements") of the various embodiments may be otherwise combined, separated, interchanged, and/or rearranged without departing from the inventive concepts.
Cross-hatching and/or shading is often used in the drawings to clarify the boundaries between adjacent elements. Thus, unless otherwise indicated, the presence or absence of cross-hatching or shading does not convey or indicate any preference or requirement for particular materials, material properties, dimensions, proportions, commonality between illustrated elements, and/or any other characteristic, attribute, property, etc., of an element. Further, in the drawings, the size and relative sizes of elements may be exaggerated for clarity and/or description. While exemplary embodiments may be implemented differently, the specific processing order may be performed differently than that described. For example, two processes described in succession may be executed substantially concurrently or in the reverse order to that described. Further, like reference numerals denote like elements.
When an element such as a layer is referred to as being "on," "connected to," or "coupled to" another element or layer, it can be directly on, connected or coupled to the other element or layer or intervening elements or layers may be present. However, when an element or layer is referred to as being "directly on," "directly connected to" or "directly coupled to" another element or layer, there are no intervening elements or layers present. To this end, the term "connected" may mean physically, electrically, and/or fluidically connected with or without intervening elements. Further, the D1 axis, the D2 axis, and the D3 axis are not limited to three axes (such as x-axis, y-axis, and z-axis) of a rectangular coordinate system, and may be interpreted in a broader sense. For example, the D1, D2, and D3 axes may be perpendicular to each other, or may represent different directions that are not perpendicular to each other. For purposes of this disclosure, "at least one of X, Y and Z" and "at least one selected from the group consisting of X, Y and Z" may be construed as X only, Y only, Z only, or any combination of two or more of X, Y and Z, such as XYZ, XYY, YZ, and ZZ, for example. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Although the terms first, second, etc. may be used herein to describe various types of elements, these elements should not be limited by these terms. These terms are used to distinguish one element from another. Thus, a first element discussed below could be termed a second element without departing from the teachings of the present disclosure.
Spatially relative terms such as "below", "under", "lower", "above", "over", "upper", "side", etc. (e.g. as in "side wall") may be used herein for descriptive purposes and thus to describe the relationship of one element to another element(s) as shown in the drawings. Spatially relative terms are intended to encompass different orientations of the device in use, operation, and/or manufacture in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. Further, the devices may be otherwise oriented (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, the terms "comprises," "comprising," "includes" and/or "including," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, components, and/or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It is also noted that, as used herein, the terms "substantially," "about," and other similar terms are used as approximate terms and not as degree terms, and thus are used to leave a margin for inherent variations in measured, calculated, and/or provided values that would be recognized by those of ordinary skill in the art.
Various exemplary embodiments are described herein with reference to cross-sectional and/or exploded views as illustrations of idealized exemplary embodiments and/or intermediate structures. As such, deviations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, example embodiments disclosed herein should not necessarily be construed as limited to the particular illustrated shapes of regions but are to include deviations in shapes that result, for example, from manufacturing. In this manner, the regions illustrated in the figures may be schematic in nature and the shapes of the regions may not reflect the actual shape of a region of a device and, thus, are not necessarily intended to be limiting.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. Terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 is a perspective view illustrating a display device including a cover window according to an exemplary embodiment.
Referring to fig. 1, an electronic device 10 includes a display device 100, the display device 100 including a display panel (see 110 in fig. 3) and a cover window (see 130 in fig. 3) attached to the display panel. The display device 100 includes a flat portion (see FA in fig. 3) and a pair of curved portions (see EA in fig. 3) positioned on both sides (edge display) of the flat portion. Although electronic device 10 is shown as a smartphone, the inventive concepts are not so limited. For example, the electronic device 10 may be embodied as a television, a mobile phone, a video phone, a smart pad, a smart watch, a tablet PC, a car navigation system, a computer display screen, a laptop computer, a Head Mounted Display (HMD), and so forth.
The pair of bent portions is formed at both sides of the flat portion to be parallel to a long side of the cover window. Further, the pair of curved portions may be formed in a predetermined shape without changing the curvature in a direction parallel to the long side of the cover window.
The pair of curved portions are formed to have the same curvature as each other, and the centers of curvature of the two curved portions may be positioned on the same side. Fig. 1 shows a case where the centers of curvature of two curved portions are positioned at the lower side of the cover window.
Fig. 2 is a sectional view illustrating a cover window and a display panel of the display device 100 of fig. 1; fig. 3 is a sectional view illustrating one of the curved portions (i.e., portion a of fig. 2) of the cover window and the display panel of fig. 2; and fig. 4 is a view showing a first radius of curvature and a first angle of the lower surface of the cover window in the first section in fig. 3.
Referring to fig. 2 to 4, the display device 100 includes a display panel 110, an adhesive layer 120 disposed on the display panel 110, and a cover window 130 disposed on the adhesive layer 120.
The display panel 110 may be a flexible display panel. For example, the display panel 110 may be a flexible organic light emitting display panel. The thin film encapsulation layer may be formed on the uppermost layer of the display panel 110.
A thin film encapsulation layer may be formed on the uppermost layer of the display panel 110 to prevent moisture and oxygen from penetrating from the outside. The thin film encapsulation layer may seal the organic light emitting diodes of the display panel 110 to reduce degradation of the organic light emitting diodes due to external moisture, and may suppress oxygen.
The thin film encapsulation layer may be provided with at least one organic layer and at least one inorganic layer. The at least one organic layer and the at least one inorganic layer may be alternately laminated. For example, the thin film encapsulation layer may include a first inorganic layer, a second inorganic layer, and an organic layer between the first inorganic layer and the second inorganic layer, but is not limited thereto.
The organic layer of the thin film encapsulation layer may be formed of a polymer, and may be, for example, a single film or a laminated film formed of any one of polyethylene terephthalate, polyimide, polycarbonate, epoxy resin, polyethylene, and polyacrylate. The inorganic layer of the thin-film encapsulation layer may be a single layer or a laminate layer comprising a metal oxide or a metal nitride. For example, the inorganic layer may include SiNx、Al2O3、SiO2And TiO2Any one of the above.
The adhesive layer 120 is disposed between the film encapsulation layer of the display panel 110 and the cover window 130, thereby attaching the display panel 110 to the inner surface of the cover window 130. The adhesive layer 120 may be a transparent adhesive layer. For example, the adhesive layer may be an Optically Clear Adhesive (OCA), a Super View Resin (SVR), a Pressure Sensitive Adhesive (PSA), an Optically Clear Resin (OCR), or a combination thereof, but is not limited thereto. In an exemplary embodiment, the adhesive layer 120 may include an acrylic adhesive.
The cover window 130 may be formed of a plastic material. For example, the cover window 130 may include polycarbonate, cyclo olefin polymer, polymethyl methacrylate, or the like. In another exemplary embodiment, the cover window 130 may include quartz, synthetic quartz, calcium fluoride, fluorine-doped quartz (F-doped quartz), soda lime glass, non-alkali glass, or the like.
The cover window 130 may include a flat portion FA and a curved portion EA connected to an end of the flat portion FA. The curved portion EA may be curved to have a curved surface in a second direction D2 perpendicular to the first direction D1, wherein the first direction D1 is a direction along which the flat portion FA extends.
According to the exemplary embodiment shown, the curved portion EA is divided into six sections, but is not limited thereto. For example, the curved portion EA may be divided into at least three sections, and the radius of curvature and the angle in each of the sections may be continuously varied (see description of fig. 5 which will be described later).
Although not shown, the display device 100 may further include a touch sensor unit and an optical film such as a polarizing film positioned between the display panel 110 and the cover window 130.
In keeping with the current design trend of the electronic device 10, the angle corresponding to the entire curved portion EA is close to 90 degrees, and the radius of curvature corresponding to the entire curved portion EA is reduced. Thus, it was confirmed that a peeling defect in which bubbles were formed between the adhesive layer 120 and the cover window 130 occurred due to the peeling load applied to the adhesive layer 120 and the stress applied to the thin film encapsulation layer (hereinafter, referred to as TFE) of the display panel 110.
The peel defect may be caused by stress applied to the thin film encapsulation layer and a peel load applied to the adhesive layer 120. Further, it is predicted that the peeling defect can be alleviated by changing the design of the inner surface of the cover window 130 in contact with the adhesive layer 120. Thus, a design suitable for minimizing TFE stress (stress applied to the thin film encapsulation layer) and OCA peel load (peel load applied to the adhesive layer 120) within the same design requirements is achieved by applying optimization techniques.
Various schemes may be used to perform the optimization techniques. For example, the configuration of the cover window 130 may be designed by using an experimental value preset via "design of experiment" (DOE), and the sum of TFE stress (σ TFE) and OCA peel load (POCA) among the experimental values may be calculated. Then, to find the minimum of the sum of TFE stress (σ TFE) and OCA peel load (POCA), the design of the coverage window 130 to minimize the values of TFE stress (σ TFE) and OCA peel load (POCA) can be achieved by optimization techniques, such as regression analysis and "least squares" methods.
"experimental design" means a scheme of selecting important factors at low cost among various factors causing abnormal variation based on statistical analysis and quantitatively measuring the effect obtained thereby. The "least squares" method refers to a scheme of processing the measurement result by performing appropriate sum of squares based on the measurement value and calculating a value that minimizes the sum of squares, and this is also referred to as "least squares fitting".
The above-described process may be performed using various known analysis tools or solutions.
In the exemplary embodiment, even when the radius of curvature of the curved portion EA of the cover window 130 is small and the central angle of the circular arc with respect to the entire curved portion EA is large, the bubble defect, the peeling defect, and the like may be prevented.
A length of the curved portion EA of the cover window 130 in the first direction D1 (in the drawing, a distance from X0 to X6) may be less than 5mm (millimeters), and a length in the second direction D2 (in the drawing, a distance from Y0 to Y6) may be less than 1.5 mm. The central angle of the circular arc of the inner surface of the cover window 130 with respect to the entire curved portion EA may be greater than 80 degrees.
According to an exemplary embodiment, the design range of the cover window 130 is as follows. A central angle of a circular arc with respect to the entire curved portion EA of the inner surface of the cover window 130 may be 88.9 degrees, the curved portion EA may be divided into six sections, a length of the curved portion EA in the first direction D1 may be 4.803mm, and a length of the curved portion EA in the second direction D2 may be 1.117 mm.
Design variables with minimal TFE stress (σ TFE) and OCA peel load (POCA) were calculated by performing optimization techniques within error ranges of 0.001mm and 0.01 degrees relative to the design range.
Table 1 below shows an optimal design of the inner surface (surface in contact with the adhesive layer 120) of the cover window 130.
< Table 1>
Figure BDA0002643308970000121
The first segment represents a segment from a point (X0, Y0) to a point (X1, Y1), the second segment represents a segment from a point (X1, Y1) to a point (X2, Y2), the third segment represents a segment from a point (X2, Y2) to a point (X3, Y3), the fourth segment represents a segment from a point (X3, Y3) to a point (X4, Y4), the fifth segment represents a segment from a point (X4, Y4) to a point (X5, Y5), and the sixth segment represents a segment from a point (X5, Y5) to a point (X6, Y6).
With respect to the virtual center of the circular arc in each section (e.g., C1 of fig. 4), "radius of curvature" represents the average radius of curvature in each section, and the angle represents the central angle of the circular arc in each section (see fig. 4).
The curved portion is divided into six sections. This is because when the curved portion is divided into too many sections, an optimal design of the cover window may not be efficiently found, and when the curved portion is divided into too few sections, a design that minimizes TFE stress (σ TFE) and OCA peel load (POCA) as compared to a simple curved portion (i.e., a design with one radius of curvature) may not be calculated.
The radius of curvature of the inner surface of the cover window 130 at the curved portion EA may be continuously varied from a portion (X0, Y0) of the cover window 130 contacting the flat portion FA to the outer edge (X6, Y6) of the cover window 130 (see fig. 5).
Table 2 below shows the design of a comparative example according to an exemplary embodiment compared to the optimal design shown in table 1 above.
< Table 2>
Figure BDA0002643308970000131
In the case of the cover window and the display panel according to the design of the comparative example, a defect occurs in which the adhesive layer between the cover window and the display panel is spaced apart from the adjacent elements to form bubbles.
In contrast, in the case of the cover window and the display panel according to the optimum design, it was confirmed that the defect that the adhesive layer between the cover window and the display panel is spaced apart from the adjacent elements to form bubbles does not occur.
Table 3 below shows values obtained by normalizing the design values of the best design.
< Table 3>
Figure BDA0002643308970000132
Fig. 5 is a graph illustrating a radius of curvature according to a position of an inner surface of the cover window at a curved portion in fig. 3.
Referring to fig. 5, although the average radius of curvature of each section is represented by a straight line, the radius of curvature of the inner surface of the actual cover window at the curved portion may be continuously varied from the portion of the cover window contacting the flat portion to the outer edge of the cover window (curved line of the graph).
Fig. 6A is a graph showing a sectional shape of a bent portion of a display device, stress of a thin film encapsulation layer, and a peel load of an adhesive layer according to a comparative example, and fig. 6B is a graph showing a sectional shape of a bent portion of a display device, stress of a thin film encapsulation layer, and a peel load of an adhesive layer according to an exemplary embodiment.
Referring to fig. 6A and 6B, according to the exemplary embodiment, it was confirmed through simulation results that the maximum value of stress (TFE stress) of the thin film encapsulation layer was reduced from 748Mpa (megapascal) to 569Mpa, compared to the comparative example.
Further, according to the exemplary embodiments, it was confirmed through simulation results that the maximum value of the peel load (OCA peel load) of the adhesive layer (optically clear adhesive (OCA)) was reduced from 4.39Mpa to 3.00Mpa, as compared to the comparative example.
In an exemplary embodiment, the cover window includes a flat portion and a curved portion extending from an end of the flat portion. The curved portion of the cover window may be divided into a plurality of sections, and each of the sections may have a radius of curvature and an angle according to an optimal design designed by an optimization technique.
For example, the curved portion of the cover window may include a first section, a second section, and a third section, wherein the second section may be disposed between the first section and the third section. The inner surface of the cover window may be a surface in contact with the adhesive layer. The first radius of curvature may be greater than the second radius of curvature, wherein the first radius of curvature is an average of the radii of curvature of the inner surface of the cover window in the first section and the second radius of curvature is an average of the radii of curvature of the inner surface of the cover window in the second section. The third radius of curvature may be greater than the second radius of curvature, wherein the third radius of curvature is an average of the radii of curvature of the inner surface of the cover window in the third section.
Therefore, even when the radius of curvature of the curved portion of the cover window is small and the central angle of the circular arc with respect to the entire curved portion is large, bubble defects, peeling defects, and the like can be prevented.
The inventive concept can be applied to an organic light emitting display device and an electronic apparatus including the same. For example, the inventive concepts may be applied to smart phones, cellular phones, video phones, smartpads, smartwatches, tablet PCs, car navigation systems, televisions, computer display screens, laptop computers, Head Mounted Display (HMD) devices, and the like.
Although certain exemplary embodiments have been described herein, other embodiments and modifications will be apparent from this description. Accordingly, the inventive concept is not limited to such embodiments, but is to be defined by the following claims and their broader scope of equivalents as will be apparent to those skilled in the art.

Claims (20)

1. A cover window, comprising:
a flat portion; and
a curved portion extending from an end of the flat portion,
wherein:
the curved portion of the cover window includes a first section, a second section, and a third section, the second section disposed between the first section and the third section;
the inner surface of the cover window is in contact with the adhesive layer;
a first radius of curvature having an average of the radii of curvature of the inner surface of the cover window in the first section is greater than a second radius of curvature having an average of the radii of curvature of the inner surface of the cover window in the second section; and
a third radius of curvature is greater than the second radius of curvature, the third radius of curvature having an average of the radii of curvature of the inner surface of the cover window in the third section.
2. The cover window of claim 1, wherein:
the curved portion of the cover window further includes a fourth section that is an outer end portion of the curved portion, and the first to third sections are positioned between the flat portion and the fourth section; and
a fourth radius of curvature is less than the third radius of curvature, the fourth radius of curvature having an average of the radii of curvature of the inner surface of the cover window in the fourth section.
3. The cover window of claim 2, wherein:
the curved portion of the cover window further comprises a fifth section, the fifth section being a portion where the curved portion connects with the flat portion, and the fifth section being positioned between the first section and the flat portion; and
a fifth radius of curvature is greater than the first to fourth radii of curvature, the fifth radius of curvature having an average of radii of curvature of the inner surface of the cover window in the fifth section.
4. The cover window of claim 3, wherein:
the curved portion of the cover window further comprises a sixth section, and the sixth section is positioned between the first section and the fifth section; and
a sixth radius of curvature, having an average of the radii of curvature of the inner surface of the cover window in the sixth section, is greater than the first radius of curvature and less than the fifth radius of curvature.
5. The cover window of claim 4, wherein:
a central angle of a circular arc of the inner surface of the cover window in the first section is a first angle;
a central angle of a circular arc of the inner surface of the cover window in the second section is a second angle;
a central angle of a circular arc of the inner surface of the cover window in the third section is a third angle;
a central angle of a circular arc of the inner surface of the cover window in the fourth section is a fourth angle;
a central angle of a circular arc of the inner surface of the cover window in the fifth section is a fifth angle;
a central angle of a circular arc of the inner surface of the cover window in the sixth section is a sixth angle;
a ratio of the first angle to the sixth angle is 1.00: 0.43: 0.43: 0.62: 0.10: 0.62; and
the ratio of the first radius of curvature to the sixth radius of curvature is 0.15: 0.12: 0.19: 0.12: 1.00: 0.24.
6. the cover window of claim 1, wherein:
a central angle of a circular arc of the inner surface of the cover window in the first section is a first angle;
a central angle of a circular arc of the inner surface of the cover window in the second section is a second angle;
a central angle of a circular arc of the inner surface of the cover window in the third section is a third angle; and
the first angle is greater than the second angle and the third angle.
7. A display device, comprising:
a flexible display panel;
a cover window disposed on the flexible display panel and including a flat portion and a curved portion extending from an end of the flat portion; and
an adhesive layer disposed between the flexible display panel and the cover window to attach the flexible display panel to the cover window,
wherein:
the curved portion of the cover window includes a first section, a second section, and a third section, the second section disposed between the first section and the third section;
an inner surface of the cover window is in contact with the adhesive layer;
a first radius of curvature having an average of the radii of curvature of the inner surface of the cover window in the first section is greater than a second radius of curvature having an average of the radii of curvature of the inner surface of the cover window in the second section; and
a third radius of curvature is greater than the second radius of curvature, the third radius of curvature having an average of the radii of curvature of the inner surface of the cover window in the third section.
8. The display device according to claim 7, wherein:
the curved portion of the cover window further includes a fourth section that is an outer end portion of the curved portion, and the first to third sections are positioned between the flat portion and the fourth section; and
a fourth radius of curvature is less than the third radius of curvature, the fourth radius of curvature having an average of the radii of curvature of the inner surface of the cover window in the fourth section.
9. The display device according to claim 8, wherein:
the curved portion of the cover window further comprises a fifth section, the fifth section being a portion where the curved portion connects with the flat portion, and the fifth section being positioned between the first section and the flat portion; and
a fifth radius of curvature is greater than the first to fourth radii of curvature, the fifth radius of curvature having an average of radii of curvature of the inner surface of the cover window in the fifth section.
10. The display device according to claim 9, wherein:
the curved portion of the cover window further comprises a sixth section, and the sixth section is positioned between the first section and the fifth section; and
a sixth radius of curvature, having an average of the radii of curvature of the inner surface of the cover window in the sixth section, is greater than the first radius of curvature and less than the fifth radius of curvature.
11. The display device according to claim 10, wherein:
a central angle of a circular arc of the inner surface of the cover window in the first section is a first angle;
a central angle of a circular arc of the inner surface of the cover window in the second section is a second angle;
a central angle of a circular arc of the inner surface of the cover window in the third section is a third angle;
a central angle of a circular arc of the inner surface of the cover window in the fourth section is a fourth angle;
a central angle of a circular arc of the inner surface of the cover window in the fifth section has a fifth angle;
a central angle of a circular arc of the inner surface of the cover window in the sixth section has a sixth angle;
a ratio of the first angle to the sixth angle is 1.00: 0.43: 0.43: 0.62: 0.10: 0.62; and
the ratio of the first radius of curvature to the sixth radius of curvature is 0.15: 0.12: 0.19: 0.12: 1.00: 0.24.
12. the display device according to claim 7, wherein:
a central angle of a circular arc of the inner surface of the cover window in the first section is a first angle;
a central angle of a circular arc of the inner surface of the cover window in the second section is a second angle;
a central angle of a circular arc of the inner surface of the cover window in the third section is a third angle; and
the first angle is greater than the second angle and the third angle.
13. The display device according to claim 7, wherein a radius of curvature of the inner surface of the cover window in the curved portion is continuously changed from a portion of the cover window in contact with the flat portion to an outer edge of the cover window.
14. The display device according to claim 7, wherein a central angle of the inner surface of the cover window with respect to a circular arc of the entire curved portion is greater than 80 degrees.
15. The display device according to claim 14, wherein:
the flat portion extends in a first direction, and the curved portion is curved in a second direction perpendicular to the first direction to form a curved surface; and
a length of the curved portion of the cover window in the first direction is less than 5mm, and a length of the curved portion of the cover window in the second direction is less than 1.5 mm.
16. The display device according to claim 7, wherein:
the flexible display panel is an organic light emitting display panel and includes a thin film encapsulation layer bonded to the adhesive layer; and
the thin film encapsulation layer includes at least one inorganic layer and at least one organic layer.
17. The display device of claim 16, wherein the adhesive layer comprises an optically clear adhesive, a super vision resin, a pressure sensitive adhesive, or an optically clear resin.
18. A display device, comprising:
a flexible display panel;
a cover window disposed on the flexible display panel and including a flat portion and a curved portion extending from an end of the flat portion; and
an adhesive layer disposed between the flexible display panel and the cover window to attach the flexible display panel to the cover window,
wherein:
an inner surface of the cover window is in contact with the adhesive layer;
the curved portion of the cover window includes a connection section connected to the flat portion, an outermost section formed at an outer edge of the cover window, and an intermediate section disposed between the connection section and the outermost section;
a connecting section radius of curvature having an average of the radii of curvature of the inner surface of the cover window in the connecting section, a middle section radius of curvature having an average of the radii of curvature of the inner surface of the cover window in the middle section, and an outermost section radius of curvature having an average of the radii of curvature of the inner surface of the cover window in the outermost section; and
the outermost section radius of curvature is less than the middle section radius of curvature.
19. The display device according to claim 18, wherein:
the intermediate section comprises a first section, a second section, and a third section, the second section disposed between the first section and the third section;
a first radius of curvature having an average of the radii of curvature of the inner surface of the cover window in the first section is greater than a second radius of curvature having an average of the radii of curvature of the inner surface of the cover window in the second section; and
a third radius of curvature is greater than the second radius of curvature, the third radius of curvature having an average of the radii of curvature of the inner surface of the cover window in the third section.
20. The display device according to claim 19, wherein:
the flexible display panel is an organic light emitting display panel and includes a thin film encapsulation layer bonded to the adhesive layer;
the thin film encapsulation layer comprises at least one inorganic layer and at least one organic layer; and
the adhesive layer includes an optically clear adhesive, a super vision resin, a pressure sensitive adhesive, or an optically clear resin.
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